U Statistics Calculator

Introduction & Importance

U statistics, also known as the Mann-Whitney U test, is a non-parametric test used to compare the distributions of two independent samples. It’s particularly useful when the data is not normally distributed or when the sample sizes are small.

For more information, see the NIST’s guide on the Mann-Whitney U test and the explanation by Statistics How To.

What is the null hypothesis of the Mann-Whitney U test?

The null hypothesis (H0) of the Mann-Whitney U test is that the two populations have identical distribution functions.